Latest Customer Reviews

K&N Air Filters Reviews

I could have purchased any air filter for my high mileage vehicle, but chose the K&amp;N due to all the positive reviews. I have not been disappointed. My fuel mileage has actually dropped, but so have the outside temperatures which I blame for the drop, not the filter.

aFe Air Filters Reviews

I have only had my filter in for about two tanks of gas but I do believe that I am getting about 10-20% better gas mileage. I do not know about other customers but my filter was a bit of a b@$%h to put in and wound up with scuffed knuckles. I think I am getting more power out of the car as a result of the AFE filter but will follow up later once I put new spark plugs and cables on the car.

Not sure which 2004 Pontiac Grand Prix Air Filters - Custom Fit is right for you? We have over 14143 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:

"I can't believe how much the K&N filter improved the performance and the gas mileage for my '04 Grand Prix. My average MPG was 21.9 before and now I am getting 25.3 the last time I checked. I just bought a second filter for my mother and talked a good friend into buying one too. Thank you K&N!
Sincerely,
Scott" —Scott B from Twelve Mile, IN bought a K&N Air Filters for a 2004 Pontiac Grand Prix.

"Before I got my K&N Air Filter my car took a little while to pick up speed but now that I have one you can feel the difference with a K&N air filter and a disposable one and better yet you can save money. The price is worth paying all you have to do is pay it once." —Juan P from Mission, TX bought a K&N Air Filters for a 2004 Pontiac Grand Prix.